1-查看当前本机JVM版本：
/usr/libexec/java_home -V
2- 安装jdk1.7
https://developer.oracle.com/java
傻瓜安装即可；
3-res
装好1.7
4-装idea
装社区版；配置jdk1.7;运行示例会出现：
objc[73488]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
的错误；原因以及解决：
https://blog.csdn.net/lizhaowei213/article/details/68951671
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